Spray drying device with filter screen

Abstract

The utility model belongs to the technical field of spray drying, and particularly discloses a spray drying device with a filter screen, which comprises a drying tower body. The material bin is communicated with the drying tower body through the conveying assembly; the filter screen is arranged in the material bin and is arranged in the conveying assembly; the blowing assembly is provided with a plurality of blowing openings, the blowing openings are formed in the filter screen, and the blowing assembly enables dust on the filter screen to fall off through airflow impact. According to the device, the filter screen is regularly cleaned in the production process, the interval time of manual cleaning of the filter screen is prolonged, the production stop frequency caused by manual cleaning of the filter screen is reduced, and therefore the production efficiency is improved. The end face, close to the dust remover, of the filter screen is in a cambered surface shape, the area of the filter screen is increased, the filtering effect is improved, and dust easily falls off from the surface of the filter screen when the filter screen is impacted.

Description

Technical Field

[0001] This utility model belongs to the field of spray drying technology, specifically relating to a spray drying device with a filter screen. Background Technology

[0002] Sodium iron phosphate pyrophosphate, due to its excellent electrochemical performance, structural stability, and strong environmental adaptability, has shown great application potential in the preparation of sodium-ion batteries as a polyanionic cathode material. Its preparation methods are diverse, encompassing various processes such as solution combustion, solid-phase synthesis, freeze-drying, spray drying, electrospinning, sol-gel, and template methods. Among these, spray drying efficiently atomizes material solutions or emulsions into tiny droplets, which are then rapidly dried in a drying tower filled with hot air to obtain a powdered product. The advantages of this technology include fast drying speed, high product purity, simple operation, and ease of large-scale production.

[0003] When using existing spray drying technology to process sodium iron phosphate pyrophosphate raw materials, filters are typically installed at the exhaust port of the drying tower to intercept sodium iron phosphate pyrophosphate dust and prevent the direct emission of waste gas containing sodium iron phosphate pyrophosphate into the atmosphere, thus avoiding environmental pollution. However, this practice also brings the following problems: as filtration time accumulates, the amount of dust accumulated on the filter increases, leading to a gradual increase in filter resistance and a reduction in dust removal efficiency. Currently, the main solution to this problem is to suspend production and manually clean the filter once low dust removal efficiency is detected. This results in frequent shutdowns, which undoubtedly negatively impacts production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a spray drying device with a filter screen. By cleaning the filter screen regularly during the production process, the interval between manual filter screen cleaning is extended, reducing the frequency of production downtime caused by manual filter screen cleaning, thereby improving production efficiency.

[0005] The objective of this invention is achieved through the following technical solution: a spray drying device with a filter screen is provided, comprising:

[0006] Drying tower body;

[0007] The material silo is connected to the drying tower via a conveyor assembly;

[0008] A filter screen is placed above the material hopper and installed in the conveying assembly;

[0009] The blowing assembly has several blowing nozzles, which are located in the filter screen. The blowing assembly uses airflow to cause the dust on the filter screen to fall off.

[0010] Preferably, the conveying assembly includes a first conveying pipe, a second conveying pipe, a dust collector, and a negative pressure blower; the drying tower body and the material silo are connected through the first conveying pipe, the material silo is provided with an exhaust port, the negative pressure blower is located outside the material silo, and the second conveying pipe connects the exhaust port and the negative pressure blower; the dust collector is located in the material silo, one end of the dust collector is connected to the first conveying pipe, and a filter screen is located between the exhaust port and the dust collector.

[0011] Preferably, several groups of dust collectors are provided, and the groups of dust collectors are connected in parallel and staggered.

[0012] Preferably, several exhaust ports are provided, and all exhaust ports are connected to a negative pressure blower.

[0013] Preferably, the blowing assembly includes a pulse valve, a blowing pipe, an air manifold, and a control logic valve; the air manifold is installed on the outside of the drying tower, the output end of the air manifold is connected to the pulse valve, one end of the blowing pipe is connected to the pulse valve, and the other end extends into the filter screen. The blowing pipe extending into the filter screen has blowing nozzles spaced apart along its length, and the control logic valve is connected to the pulse valve.

[0014] Preferably, the end face of the filter screen near the dust collector is arc-shaped.

[0015] Preferably, several groups of filter screens are provided, and adjacent filter screens are connected by elastic bands.

[0016] Preferably, the device further includes an atomizing component, which includes a motor, an atomizing nozzle, and a centrifugal atomizing disc; the motor is located outside the drying tower body, and its output end is connected to the centrifugal atomizing disc; the atomizing nozzle is above the centrifugal atomizing disc and is connected to the feed inlet.

[0017] Preferably, the centrifugal atomizing disc has a number of material holes penetrating its surface.

[0018] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0019] This invention relates to a spray drying device with a filter screen. By incorporating the filter screen and a spray assembly, it reduces the dust content of sodium iron phosphate pyrophosphate in the emitted gas, thus minimizing environmental impact. The spray assembly impacts and knocks the dust trapped on the filter screen into the material hopper, preventing dust from clogging the filter screen and preventing waste due to raw material discharge. Furthermore, this invention allows for filter screen cleaning without stopping production, improving production efficiency. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the structure of a spray drying device with a filter screen according to the present invention.

[0022] Figure 2 This is a schematic diagram of a centrifugal atomizing disc;

[0023] Figure 3 A schematic diagram of the jet-blowing assembly and filter screen;

[0024] Figure 4 This is a schematic diagram of the blowpipe.

[0025] Figure label:

[0026] 1-Drying tower body, 11-Feed inlet, 12-Air outlet, 13-First discharge outlet, 14-Buffer chamber, 15-Sintering chamber, 151-Air inlet;

[0027] 2-Atomizing component, 21-Motor, 211-Rotating shaft, 22-Atomizing nozzle, 23-Centrifugal atomizing disc, 231-Material orifice;

[0028] 3-Material bin, 31-Second discharge port, 32-Exhaust port;

[0029] 4-Filter screen, 41-Elastic band;

[0030] 5-Pulse jet assembly, 51-Pulse valve, 52-Pulse jet pipe, 53-Air manifold, 54-Control logic valve, 55-Pulse jet nozzle;

[0031] 6-Conveying assembly; 61-First conveying pipe; 62-Second conveying pipe; 63-Dust collector; 64-Negative pressure blower; 7-Compressed air tank; 8-Storage bin. Detailed Implementation

[0032] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] Please see Figure 1 and Figure 3 A spray drying device with a filter screen includes: a drying tower body 1, a material bin 3, a filter screen 4, and a spray assembly 5.

[0034] Material silo 3 is connected to drying tower 1 via conveying assembly 6; filter screen 4 is placed above material silo 3 and is located within conveying assembly 6; blowing assembly 5 has several blowing nozzles 55, which are located within filter screen 4. The blowing assembly 5 uses airflow to cause dust on filter screen 4 to fall off. Specifically, drying tower 1 has a feed inlet 11 and an outlet 12 at its upper end, and a first discharge outlet 13 at its lower end. Drying tower 1 includes a buffer chamber 14 and a sintering chamber 15 that are interconnected. Buffer chamber 14 is connected to feed inlet 11, and liquid material containing sodium iron phosphate pyrophosphate enters buffer chamber 14 from feed inlet 11. Sintering chamber 15 is connected to outlet 12, which is connected to an external induced draft fan. Sintering chamber 15 has multiple sets of air inlets 151 symmetrically arranged on both sides, which are connected to an external compressed gas tank 7. Compressed gas tank 7 stores inert gas, such as argon, and the inert gas is hot. Inert gas is used to prevent the material from reacting at high temperatures, which helps maintain the chemical stability and properties of the material and improves its quality and reliability. The material silo 3 is connected to the sintering silo 15 via the conveying assembly 6. The dried material enters the material silo 3 via the conveying assembly 6. The material silo is equipped with a second discharge port 31, which is connected to the external storage tank 8. The storage tank 8 is used to collect sodium iron phosphate pyrophosphate.

[0035] This invention relates to a spray drying device with a filter screen. In use, liquid material enters the buffer chamber 14 through the inlet 11. After passing through the buffer chamber 14, the liquid material is dispersed into extremely small droplets, forming a mist. The atomized droplets come into contact with hot gas, causing rapid evaporation of moisture, and the material is dried into powder or granules in a very short time. Inert gas from the compressed gas tank 7 is compressed and conveyed into the sintering chamber 15. The increased kinetic energy of the gas molecules accelerates the evaporation rate of moisture. Moisture on the surface of the droplets evaporates first, then gradually diffuses inward until the entire droplet is completely dry. Due to the rapid evaporation rate, the evaporated water vapor is quickly discharged from the outlet 12 by the induced draft fan. The dried material enters the material chamber 3 through the conveying assembly 6. Coarser material particles fall directly into the lower layer of the material chamber 3 and flow out from the second outlet 31, while finer dust particles rise with the airflow to the outer surface of the filter screen 4 for filtration. The filtered gas reduces the content of sodium iron phosphate pyrophosphate dust, thus reducing the environmental impact. The jet cleaning component 5 is activated periodically to dislodge dust accumulated on the filter screen 4 into the material hopper 3. This not only prevents dust from clogging the filter screen 4 and maintains its dust removal efficiency, but also blows the sodium iron phosphate pyrophosphate dust off the filter screen into the material hopper 3, preventing raw material waste. Using this device, the filter screen 4 can be cleaned periodically without stopping production, extending the interval between manual filter cleanings and reducing downtime caused by manual cleaning, thereby improving production efficiency.

[0036] Please see Figure 1 Furthermore, the conveying assembly 6 includes a first conveying pipe 61, a second conveying pipe 62, a dust collector 63, and a negative pressure blower 64. The drying tower body 1 and the material silo 3 are connected through the first conveying pipe 61. The material silo 3 is provided with an exhaust port 32. The negative pressure blower 64 is located outside the material silo 3. The second conveying pipe 62 connects the exhaust port 32 and the negative pressure blower 64. The dust collector 63 is located in the material silo 3. One end of the dust collector 63 is connected to the first conveying pipe 61, and the filter screen 4 is located between the exhaust port 32 and the dust collector 64. Specifically, one end of the first conveying pipe 61 is connected to the material silo 3 by threaded connection or welding, and the other end is connected to the drying tower body 1. The dust collector 63 is provided with an outlet for material discharge and an outlet for airflow discharge. The outlet for airflow discharge is close to the filter screen 4. In operation, the negative pressure blower 64 is activated to generate negative pressure, drawing the material into the first conveying pipe 61. The material then passes through the dust collector 63 for dust separation and purification. Coarser material particles fall directly into the material hopper from the material discharge outlet, while finer dust rises with the airflow to the filter screen 4 for filtration. The fine dust in the airflow is trapped on the outer surface of the filter screen 4. The negative pressure blower 64 then discharges the filtered gas through the second conveying pipe 62, reducing environmental impact. Preferably, the bottom of the sintering chamber 15 is cone-shaped, with the first discharge port 13 located at the very bottom of the cone for convenient material flow.

[0037] Furthermore, several groups of dust collectors 63 are set up, and these groups of dust collectors 63 are connected in parallel and staggered. The parallel and staggered arrangement of multiple groups of dust collectors 63 improves production efficiency, and when a dust collector 63 malfunctions, it avoids immediate shutdown. The material in the drying tower 1 can be processed before the shutdown is stopped to deal with the malfunction.

[0038] Furthermore, several exhaust ports 32 are provided, and each exhaust port 32 is connected to the negative pressure blower 64. Providing multiple exhaust ports 32 improves exhaust efficiency.

[0039] Please see Figure 3 and Figure 4Furthermore, the blowing assembly 5 includes a pulse valve 51, a blowing pipe 52, an air manifold 53, and a control logic valve 54. The air manifold 53 is installed on the outside of the drying tower body 1, and its output end is connected to the pulse valve 51. One end of the blowing pipe 52 is connected to the pulse valve 51, and the other end extends into the filter screen 4. The blowing pipe 52 extending into the filter screen 4 has blowing nozzles 55 spaced along its length. The control logic valve 54 is connected to the pulse valve 51. Specifically, multiple sets of blowing nozzles 55 are provided, each set spaced along the length of the blowing pipe 52, so that the airflow can blow onto the filter screen 4 from multiple directions, such as downwards and to the sides. In use, the blowing assembly 5 is started, and the control logic valve 54 opens the pulse valve 51 according to the set program. When the pulse valve 51 opens, compressed gas is rapidly injected into the filter screen 4 through the blowing pipe 52, forming a powerful airflow impact. This airflow impact causes the filter screen 4 to vibrate and deform, thereby shaking off the accumulated dust on the filter screen 4. After the cleaning process is completed, pulse valve 51 closes, and filter screen 4 continues to operate.

[0040] Please see Figure 1 and Figure 3 Furthermore, the end face of the filter screen 4 near the dust collector 63 is arc-shaped. Specifically, the area of ​​the filter screen 4 covers and is much larger than the area formed between the exhaust ports 32, and the filter screen 4 is circumferentially sealed to the top inner wall of the material bin 3 near the exhaust port 32, preventing gas from flowing directly out of the exhaust port. This structure increases the area of ​​the filter screen 4, improves the filtration effect, and makes it easier for dust to fall off the surface of the filter screen 4 when it is subjected to impact.

[0041] Please see Figure 3 Furthermore, several sets of filter screens 4 are provided, and adjacent filter screens 4 are connected by elastic bands 41. By using elastic bands 41 to connect the filter screens 4, when subjected to the blowing assembly 5, the filter screens 4 vibrate and deform, which prolongs the vibration and deformation time and assists in the dust falling from the surface of the filter screens 4. Preferably, the elastic bands 41 are rubber bands, with both ends fixed to the edges of adjacent filter screens 4. Preferably, the filter screens 4 are connected circumferentially to the inner top wall of the material bin 3 near the exhaust port 32 by elastic rubber bands, which also assists in the dust falling from the surface of the filter screens 4.

[0042] Please see Figure 1 and Figure 2Furthermore, the device also includes an atomizing component 2, which includes a motor 21, an atomizing nozzle 22, and a centrifugal atomizing disc 23. The motor 21 is located outside the drying tower body 1, and its output end is connected to the centrifugal atomizing disc 23. The atomizing nozzle 22 is located above the centrifugal atomizing disc 23. Specifically, the centrifugal atomizing disc 23 has material holes 231 penetrating its surface. The atomizing nozzle 22 is located at the port of the buffer chamber 14 away from the feed inlet 11, and is connected to the buffer chamber 14. Above the centrifugal atomizing disc 23, the atomizing nozzle 22 disperses the liquid material into extremely small droplets with a diameter of 10-30 micrometers, forming a mist. The motor 21 also includes a rotating shaft 211, which is installed at the output end of the motor 21 and penetrates through the buffer chamber 14. A centrifugal atomizing disc 23 is mounted on the end of a rotating shaft 211. Starting the motor 21 drives the rotating shaft 211 to rotate, thereby causing the centrifugal atomizing disc 23 to rotate at a high speed between 10,000 and 20,000 rpm. Material droplets are conveyed onto the surface of the high-speed rotating centrifugal atomizing disc 23. Material holes 231 are evenly spaced on the surface of the centrifugal atomizing disc 23, with a diameter of 0.1-0.5 mm. If the diameter of the material holes 231 is less than 0.1 mm, they are easily blocked by material droplets; if it is greater than 0.5 mm, the droplet diameter is too large, which is not conducive to further ejection and dispersion into fine droplets. Under the action of centrifugal force, the liquid is thrown out and dispersed into fine droplets. The fine droplets form a thin film on the surface of the porous centrifugal atomizing disk 23. When the film reaches the edge of the centrifugal atomizing disk 23, it will break and atomize into fine droplets due to the action of centrifugal force and surface tension. Due to gravity, the droplets will move downward along the tangent of the centrifugal atomizing disk 23 and enter the sintering chamber 15. The fine droplets can accelerate drying.

[0043] This invention relates to a spray drying device with a filter screen. The device includes a filter screen 4 and a blowing assembly 5. The emitted gas contains less sodium iron phosphate pyrophosphate dust, reducing environmental impact. The blowing assembly 5 causes the dust retained on the filter screen 4 to fall into the material hopper 3, preventing dust from clogging the filter screen 4 and preventing waste due to raw material discharge. This invention does not require stopping production when cleaning the filter screen 4, improving production efficiency. Multiple dust collectors 63 and multiple exhaust ports 32 are also included to further enhance production efficiency. The end face of the filter screen 4 near the dust collector 63 is arc-shaped, increasing the filter area and improving filtration efficiency. Furthermore, when the filter screen 4 is subjected to impact, dust easily falls off its surface. The elastic band 41 extends the vibration and deformation time, further aiding in the dust removal process. The centrifugal atomizing disc 23 with material holes 231 on its surface is used to not only adjust and throw out the material, but also further refine the material droplets.

[0044] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A spray drying apparatus with a filter screen, characterized in that, include: Drying tower body (1); The material silo (3) is connected to the drying tower body (1) via the conveying assembly (6); A filter screen (4) is placed above the material bin (3) and disposed within the conveying assembly (6); and The blowing assembly (5) is provided with several blowing nozzles (55), which are located in the filter screen (4). The blowing assembly (5) causes the dust on the filter screen (4) to fall off through airflow impact.

2. The spray drying apparatus with a filter screen according to claim 1, characterized in that, The conveying assembly (6) includes a first conveying pipe (61), a second conveying pipe (62), a dust collector (63), and a negative pressure blower (64); the drying tower body (1) and the material silo (3) are connected through the first conveying pipe (61), the material silo (3) is provided with an exhaust port (32), the negative pressure blower (64) is located outside the material silo (3), and the second conveying pipe (62) connects the exhaust port (32) and the negative pressure blower (64); the dust collector (63) is located in the material silo (3), one end of the dust collector (63) is connected to the first conveying pipe (61), and the filter screen (4) is located between the exhaust port (32) and the dust collector (63).

3. The spray drying apparatus with a filter screen according to claim 2, characterized in that, Several groups of dust collectors (63) are set up, and the groups of dust collectors (63) are connected in parallel and staggered.

4. The spray drying apparatus with a filter screen according to claim 2 or 3, characterized in that, Several exhaust ports (32) are provided, and all exhaust ports (32) are connected to the negative pressure blower (64).

5. The spray drying apparatus with a filter screen according to any one of claims 1 to 3, characterized in that, The blowing assembly (5) includes a pulse valve (51), a blowing pipe (52), an air tank (53), and a control logic valve (54). The air tank (53) is installed on the outside of the drying tower body (1), and the output end of the air tank (53) is connected to the pulse valve (51). One end of the blowing pipe (52) is connected to the pulse valve (51), and the other end extends into the filter screen (4). The blowing pipe (52) extending into the filter screen (4) has blowing ports (55) spaced along its length. The control logic valve (54) is connected to the pulse valve (51).

6. The spray drying apparatus with a filter screen according to claim 2 or 3, characterized in that, The end face of the filter screen (4) near the dust collector (63) is arc-shaped.

7. The spray drying apparatus with a filter screen according to claim 4, characterized in that, The end face of the filter screen (4) near the dust collector (63) is arc-shaped.

8. The spray drying apparatus with a filter screen according to claim 1, 2, 3 or 7, characterized in that, Several groups of filter screens (4) are set up, and adjacent filter screens (4) are connected by elastic bands (41).

9. The spray drying apparatus with a filter screen according to claim 1, 2, 3 or 7, characterized in that, It also includes an atomizing component (2), which includes a motor (21), an atomizing nozzle (22), and a centrifugal atomizing disc (23). The motor (21) is located outside the drying tower (1), and its output end is connected to the centrifugal atomizing disc (23). The atomizing nozzle (22) is located above the centrifugal atomizing disc (23).

10. The spray drying apparatus with a filter screen according to claim 9, characterized in that, The centrifugal atomizing disc (23) has several material holes (231) that penetrate its surface.

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